Siemens SIMATIC ET 200AL, System Manual

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Table of contents
Communication
Function Manual, 05/2021, A5E03735815-AJ
11
3.7 SNMP .............................................................................................................................. 104
3.7.1 Disabling SNMP ............................................................................................................... 104
3.7.2 Example: Disabling SNMP for a CPU 1516-3 PN/DP ............................................................ 105
4 PG communication ............................................................................................................................ 107
5 HMI communication .......................................................................................................................... 110
6 Open User Communication ................................................................................................................ 112
6.1 Overview of Open User Communication ........................................................................... 112
6.2 Protocols for Open User Communication .......................................................................... 113
6.3 Instructions for Open User Communication ...................................................................... 115
6.4 Open User Communication with addressing via domain names ........................................ 119
6.5 Setting up Open User Communication via TCP, ISO-on-TCP, UDP and ISO .......................... 122
6.6 Setting up communication over FDL ................................................................................. 128
6.7 Setting up communication with Modbus TCP .................................................................... 130
6.8 Setting up communication via e-mail ............................................................................... 133
6.9 Setting up communication via FTP ................................................................................... 134
6.10 Establishment and termination of communications relations ............................................ 137
7 S7 communication ............................................................................................................................. 138
8 Point-to-point link .............................................................................................................................. 147
9 OPC UA communication ..................................................................................................................... 152
9.1 What you need to know about OPC UA ............................................................................. 152
9.1.1 OPC UA and Industrie 4.0 ................................................................................................. 152
9.1.2 General features of OPC UA .............................................................................................. 153
9.1.3 OPC UA for S7-1200/S7-1500 CPUs .................................................................................. 156
9.1.4 Access to OPC UA applications ......................................................................................... 157
9.1.5 Addressing nodes ............................................................................................................ 161
9.1.6 What you need to know about OPC UA clients .................................................................. 165
9.1.7 Mapping of data types ..................................................................................................... 169
9.2 Security at OPC UA ........................................................................................................... 172
9.2.1 Security settings .............................................................................................................. 172
9.2.2 Certificates pursuant to ITU X.509 .................................................................................... 173
9.2.3 Certificates with OPC UA .................................................................................................. 177
9.2.4 Creating self-signed certificates ........................................................................................ 178
9.2.5 Generating PKI key pairs and certificates yourself ............................................................. 179
9.2.6 Secure transfer of messages ............................................................................................. 182
9.2.7 Certificate management via Global Discovery Server (GDS) ............................................... 185
9.2.7.1 Automated certificate management with GDS .................................................................. 185
9.2.7.2 Configuration limits for Push function .............................................................................. 188
9.2.7.3 Setting and loading GDS parameters ................................................................................ 189
9.2.7.4 GDS commissioning ......................................................................................................... 190
9.2.7.5 Address model for the push certificate management ........................................................ 194
9.2.7.6 CertificateGroups in the address model ............................................................................ 199